Hi, I have a 2003 Tiffin Allegro with 18,000 miles on a 8.1L Workhorse v8. Workhorse W22 chassis. We bought it last October (2020). Then we both got covid, then I got pneumonia. We have only camped in it 3 times and those have been in May 2021. We have not used 2 full tanks of gas. It ran great until this last Monday. On our way to Alum Creek State Park it ran great 3/4 of the way there. Then it spit, sputtered and died 12 times. Luckily it restarted every time and we got their safe. I called my son who is a Mechanic. He said check for loose battery cables connections, Install new air filter and new fuel filter which I did. i also put 2 bottles of HEET in about 30 gallons of gas (in case of water) along with a bottle of injector cleaner. I thought we'd fixed it but about 4 miles from home on our return trip it did it again twice! I am old but still handy and can change the plugs and wired but if that was it, it wouldn't be intermittent? I called my nephew,a mechanic, and he thinks it is the fuel pump. I don't know if i'm handy enough to remove the gas tank to change the fuel pump. Would the fuel pump be intermittent?